code: def test_dataframe_response(self):
      response = self.df.chat(
          "Load ID and pricipal of paidoff loan ordered by Loan ID",
          "dataframe",
      )
      self.assertTrue(response.head_csv.find("Loan_ID,Principal") != -1)
      self.assertTrue(response.head_csv.find("xqd20160003,1000") != -1)
      self.assertTrue(response.head_csv.find("xqd12160159,1000") != -1)
      self.assertTrue(response.head_csv.find("xqd20160004,1000") != -1)
  
file_path: pandas-ai/integration/test_loan_payments.py
imports: import os
  import unittest
  from pandasai import SmartDataframe
  from pandasai.llm import OpenAI
label_desc: Use image node_id 5 for calling the TestLoanPayments obj's underlying member method code with example usage: obj.test_dataframe_response() without return types